Backfiring

["Perry,Keith [PYR]" <Keith.Perry@ec.gc.ca>]

My '61 TR-03A started to backfire yesterday.  I had just filled up with
gas, turned the engine and KABOOM!  But it started okay.  I then drove a
couple blocks home, turned the engine off but cranked it about 2 minutes
later and it did it again (only not quite as loud).

My questions are:

1) what causes this?

2) would the new tank of gas have anything to do with it?

3) what can I do about it?

thanks for all your help,

Keith Perry
'61 TR-03A
TS81247